Biotechnology for Biofuels | |
A comparative study of ethanol production using dilute acid, ionic liquid and AFEX™ pretreated corn stover | |
Nirmal Uppugundla5  Leonardo da Costa Sousa5  Shishir PS Chundawat1  Xiurong Yu4  Blake Simmons3  Seema Singh3  Xiadi Gao2  Rajeev Kumar2  Charles E Wyman2  Bruce E Dale5  Venkatesh Balan5  | |
[1] Department of Biochemistry, Department of Energy (DOE) Great Lakes Bioenergy Research Center (GLBRC), University of Wisconsin, Madison, WI 53706, USA | |
[2] Center for Environmental Research and Technology (CE-CERT), Bourns College of Engineering, University of California Riverside, 1084 Columbia Avenue, Riverside, CA 92507, USA | |
[3] Biological and Material Science Center, Sandia National Laboratories, Livermore, CA 94550, USA | |
[4] Jilin TuoPai Agriculture Products Development Ltd, Jilin, China | |
[5] Department of Chemical Engineering and Materials Science, Department of Energy (DOE) Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, USA | |
关键词: Cellulosic ethanol; Enzymatic hydrolysis; Pretreatment; Ionic liquid; Dilute acid; AFEX; | |
Others : 792477 DOI : 10.1186/1754-6834-7-72 |
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received in 2013-10-11, accepted in 2014-02-19, 发布年份 2014 | |
【 摘 要 】
Background
In a biorefinery producing cellulosic biofuels, biomass pretreatment will significantly influence the efficacy of enzymatic hydrolysis and microbial fermentation. Comparison of different biomass pretreatment techniques by studying the impact of pretreatment on downstream operations at industrially relevant conditions and performing comprehensive mass balances will help focus attention on necessary process improvements, and thereby help reduce the cost of biofuel production.
Results
An on-going collaboration between the three US Department of Energy (DOE) funded bioenergy research centers (Great Lakes Bioenergy Research Center (GLBRC), Joint BioEnergy Institute (JBEI) and BioEnergy Science Center (BESC)) has given us a unique opportunity to compare the performance of three pretreatment processes, notably dilute acid (DA), ionic liquid (IL) and ammonia fiber expansion (AFEXTM), using the same source of corn stover. Separate hydrolysis and fermentation (SHF) was carried out using various combinations of commercially available enzymes and engineered yeast (Saccharomyces cerevisiae 424A) strain. The optimal commercial enzyme combination (Ctec2: Htec2: Multifect Pectinase, percentage total protein loading basis) was evaluated for each pretreatment with a microplate-based assay using milled pretreated solids at 0.2% glucan loading and 15 mg total protein loading/g of glucan. The best enzyme combinations were 67:33:0 for DA, 39:33:28 for IL and 67:17:17 for AFEX. The amounts of sugar (kg) (glucose: xylose: total gluco- and xylo-oligomers) per 100 kg of untreated corn stover produced after 72 hours of 6% glucan loading enzymatic hydrolysis were: DA (25:2:2), IL (31:15:2) and AFEX (26:13:7). Additionally, the amounts of ethanol (kg) produced per 100 kg of untreated corn stover and the respective ethanol metabolic yield (%) achieved with exogenous nutrient supplemented fermentations were: DA (14.0, 92.0%), IL (21.2, 93.0%) and AFEX (20.5, 95.0%), respectively. The reason for lower ethanol yield for DA is because most of the xylose produced during the pretreatment was removed and not converted to ethanol during fermentation.
Conclusions
Compositional analysis of the pretreated biomass solids showed no significant change in composition for AFEX treated corn stover, while about 85% of hemicellulose was solubilized after DA pretreatment, and about 90% of lignin was removed after IL pretreatment. As expected, the optimal commercial enzyme combination was different for the solids prepared by different pretreatment technologies. Due to loss of nutrients during the pretreatment and washing steps, DA and IL pretreated hydrolysates required exogenous nutrient supplementation to ferment glucose and xylose efficiently, while AFEX pretreated hydrolysate did not require nutrient supplementation.
【 授权许可】
2014 Uppugundla et al.; licensee BioMed Central Ltd.
【 预 览 】
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